I had a Model 18 and loved the trigger pull. Excellent weapon but I sold it and bought this Model 617. I like the 10 shot capacity better than the 6. I use it for Steel Challenge matches and with speed loaders it's a pleasure to shoot.
Mine is highly modified. I have a smooth 7 lb double action trigger pull but it took a lot of work to get it there.
The Model 18 had a super smooth double action pull from the factory. Those old Smiths are hard to not like.